The document discusses the spread of Buddhism from the 3rd to 7th centuries through major trade routes like the Indian Ocean trading routes and Silk Road. Buddhism slowly moved into China in the 1st century CE, spread by Chinese pilgrims traveling in both directions. It was not heavily promoted by the Harsha or Sui dynasties in China. The spread of Buddhism into Korea is hinted at, while Japan is ignored. Cultural transmission of Buddhist statuary is seen over time in Korea, Japan, and Thailand, showing the religion's influence over the region.